Dimmer switch for a lamp or similar article



FIG. 1 is a front perspective view of a dimmer switch for a lamp or similar article showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side elevational view thereof, the left side being a mirror image;

FIG. 4 is a bottom plan view thereof; and

FIG. 5 is a rear elevational view thereof. 

The ornamental design for a dimmer switch for a lamp or similar article, substantially as shown and described. 